Abstract
We discuss the uncertainty related to the amount of unwanted B→K0⁎(Kπ)ℓ+ℓ− events in the sample of B→K⁎(Kπ)ℓ+ℓ− ones. Those events can increase the measured differential decay rate by up to 10% in the low q2 region, and can be a source of non-negligible uncertainty in the full angular distribution of the B→K⁎(Kπ)ℓ+ℓ− decay. Although the transverse asymmetries should be unaffected by the presence of the S-wave Kπ pairs, coming from the scalar K0⁎ meson, we show that in practice, their normalization might be sensitive to those events and could entail a sizable uncertainty in transverse asymmetries around q2=2 GeV2. For other q2ʼs that error is under 10%.
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